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| All Patents in class 72/236 | |||||
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| Number | Date | Patentee | Title | Type | |
| 4,587,822 | May 13, 1986 | C.R. Bradlee | Tension leveling apparatus | ||
| 5,255,549 | Oct. 26, 1993 | R.A. Williams | Tension leveler roll cleaning system and method | ||